PT Snacks Podcast: Physical Therapy with Dr. Kasey Hankins 109. Shoulder Instability - Factors that Affect Shoulder Stability
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Nov 19, 2024 Explore the fascinating world of shoulder instability and discover the types of dislocations that can occur. Learn about the anatomical features that keep the shoulder stable and the crucial roles of both passive and active stabilizers. This discussion emphasizes understanding the causes behind instability, making it an essential listen for anyone interested in rehabilitation and injury prevention!
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Shoulder Instability Prevalence
- Shoulder dislocations are common, representing 45% of all dislocations.
- The shoulder's ball-and-socket structure, with a 4:1 head-to-glenoid ratio, makes it inherently unstable.
Dislocation Types and Demographics
- 96% of shoulder dislocations are anterior, while posterior dislocations are significantly less frequent (2-4%).
- Posterior dislocations occur more in males (21-30) and older females (61-80).
Passive Shoulder Stabilizers
- Passive stabilizers like bony geometry, glenoid labrum, and negative intra-articular pressure contribute to shoulder stability.
- Adhesion and cohesion forces within the joint also play a role.